I do not know if this is what you want to do, but if it is the same show, one in English and the other in french, just use 2 systems, one will stream in english, and via NDI, use that output as the input for the other system, and have that stream the french....you will just have to mute the audio from the main system input...so, both systems will be streaming at the same time...but, I think you may need 2 licenses to have both systems on line at the same time....I did something similar with a lecture. The main room was in english, and 2 rooms, one french, and another room was spanish...I had 2 systems using the SD free version of vMix, and took the audio feed from the interpreters' feed to each room, and it went great....The interpreters were using wireless systems, so all I did was plug the receivers into the sound for each room....the setup is the same for streaming, as I recorded on each system, so for reference, all 3 languages were recorded.....in your case, you will just stream...hope you get it done.....but just remember you may need 2 licenses of vMix to do it.....try the free version as a test to see if that works for you.....